Abstract:

【OBJECTIVE】 In order to elucidate the different responses of different rice cultivars to cadmium and provide theoretical reference for selecting cadmium-tolerant varieties and breeding cadmium-tolerant species. 【METHOD】By using the techniques of laboratory bioassay, the seeds of 12 varieties of rice mainly cultivated in the province of Guizhou were treated with Cd solution of different concentrations. The germination rate, germination index, vigor index, root length, shoot height and fresh weight of root and shoot, semilethal cadmium concentration and lethal cadmium concentration were measured to assess the cadmium-resistant ability of rice by Membership Function. 【RESULTS】The results showed that the inhibitive effects on the seed germinations obviously increased with the increase of Cd concentrations. And the germination rate, germination index, vigor index, root length, shoot height and fresh weight of root and shoot were reduced. The vigor index, root length and root fresh weight were more sensitive to Cd stress. There were significant differences in seed germination among different rice cultivars. Semilethal Cd concentration were 208~955 μmol/L, and lethal Cd concentration were 940~3678 μmol/L. 【CONCLUSION】In all the 12 cultivars, II you 808 and Chuanjiangyou 3 was tolerant to Cd, Zhongyou 9801, Yixiangyou 101, Gangyou 725 and Yixiang 1979 were sensitive and the others were moderately tolerant.